[RFC PATCH kvmtool 2/5] Allow architectures to hook KVM_EXIT_SYSTEM_EVENT

[Oliver Upton]

Certain system events require architecture-specific handling. Allow
architectures to intervene for exits unhandled by the default exit
handler.

Signed-off-by: Oliver Upton <oupton at google.com>
---
 include/kvm/kvm-cpu.h | 1 +
 kvm-cpu.c             | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/kvm/kvm-cpu.h b/include/kvm/kvm-cpu.h
index 0f16f8d..75e42d8 100644
--- a/include/kvm/kvm-cpu.h
+++ b/include/kvm/kvm-cpu.h
@@ -20,6 +20,7 @@ void kvm_cpu__run(struct kvm_cpu *vcpu);
 int kvm_cpu__start(struct kvm_cpu *cpu);
 bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu);
 int kvm_cpu__get_endianness(struct kvm_cpu *vcpu);
+bool kvm_cpu__arch_handle_system_event(struct kvm_cpu *vcpu);
 
 int kvm_cpu__get_debug_fd(void);
 void kvm_cpu__set_debug_fd(int fd);
diff --git a/kvm-cpu.c b/kvm-cpu.c
index 7dec088..d615c37 100644
--- a/kvm-cpu.c
+++ b/kvm-cpu.c
@@ -23,6 +23,11 @@ int __attribute__((weak)) kvm_cpu__get_endianness(struct kvm_cpu *vcpu)
 	return VIRTIO_ENDIAN_HOST;
 }
 
+bool __attribute__((weak)) kvm_cpu__arch_handle_system_event(struct kvm_cpu *vcpu)
+{
+	return false;
+}
+
 void kvm_cpu__enable_singlestep(struct kvm_cpu *vcpu)
 {
 	struct kvm_guest_debug debug = {
@@ -224,6 +229,9 @@ int kvm_cpu__start(struct kvm_cpu *cpu)
 			 */
 			switch (cpu->kvm_run->system_event.type) {
 			default:
+				if (kvm_cpu__arch_handle_system_event(cpu))
+					break;
+
 				pr_warning("unknown system event type %d",
 					   cpu->kvm_run->system_event.type);
 				/* fall through for now */
-- 
2.35.1.723.g4982287a31-goog